One aspect that interests me is the relative difficulty of "part time" employment. We define "full time" as 40 hours a week (number may vary depending on location and field, but that's the stereotypical value). The wage that brings in may be, for successful people in a reasonably lucrative field, substantially more than needed for a comfortable life.

But let's say I decide that I'd be happy with my life at 50% of my current pay, and I want to do 50% less work in exchange. 20 hours per week instead of 40. If you're in the kind of job that makes enough for this to work, you probably can't do it. 20 hours per week is for crappy jobs in retail and food service. It's very unlikely that you'll find a tech job willing to employ you part time at any pay level.

So even if I, personally, am sufficiently productive and sufficiently compensated that I could afford to work a lot less than people did 50 years ago, I can't do it. At least, I can't do it on a rolling basis. The closest I can come is to retire early. Or maybe take some years off in the middle of my career, but that's extremely risky. I definitely can't cut my hours and pay in half in a given week, or month, or even year.